he looks to be in Petty good condition the darker spots could be just his adult coloring coming out. the white could be a bit of ICK I would feed him for the next 2 weeks with garlic extreme and selcon or zoecon and garlic. that Nem in the third picture may have tagged him and stressed him a bit and that would account for the shaking Nems have a nerve toxin they inject so if he was not tagged hard he will live and if he was hit hard he will not watch for him to loss his apatite that is the first sign of never toxin poisoning that is fatal. Just a though does it look like he is shaking his head?
The white on his tail maybe fungus need a better pic of both sides.
Try this for taking a pic get a white ice cream pail and cut it down so you can put the camera lens through a hole in the bottom and it will not touch the side of the tank. When taking a pic this way try using a flash and without a flash, don't worry if the flash is attached to the camera as the white pail will diffuse it and give you a better diffusion with out a backwash image on the pick. This should also allow you to get a better closeup pic.
Bill